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Add flex_grow and flex_shrink.

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Two new elements:
- flex_grow  : Expand the element to occupy free space.
- flex_shrink: Minimize the element leave away missing space.

flex = flex_grow | flex_shrink.

Other changes:
- hbox and vbox are now non flexible by default.
- the vtext element has been added to help writting tests.
- Many new tests.
This commit is contained in:
ArthurSonzogni
2020-06-01 23:40:32 +02:00
committed by Arthur Sonzogni
parent 7f7775ba62
commit 08ee49f3e6
17 changed files with 929 additions and 189 deletions
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96
src/ftxui/dom/vbox.cpp
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@@ -15,11 +15,13 @@ class VBox : public Node {
VBox(Elements children) : Node(std::move(children)) {}
~VBox() {}
void ComputeRequirement() {
void ComputeRequirement() override {
requirement_.min_x = 0;
requirement_.min_y = 0;
requirement_.flex_x = 0;
requirement_.flex_y = 1;
requirement_.flex_grow_x = 0;
requirement_.flex_grow_y = 0;
requirement_.flex_shrink_x = 0;
requirement_.flex_shrink_y = 0;
for (auto& child : children) {
child->ComputeRequirement();
if (requirement_.selection < child->requirement().selection) {
@@ -34,34 +36,92 @@ class VBox : public Node {
}
}
void SetBox(Box box) {
void SetBox(Box box) override {
Node::SetBox(box);
int flex_sum = 0;
for (auto& child : children)
flex_sum += child->requirement().flex_y;
int space = box.y_max - box.y_min + 1;
int extra_space = space - requirement_.min_y;
int remaining_flex = flex_sum;
int remaining_extra_space = extra_space;
int size = 0;
int flex_grow_sum = 0;
int flex_shrink_sum = 0;
int flex_shrink_size = 0;
for (auto& child : children) {
const Requirement& r = child->requirement();
flex_grow_sum += r.flex_grow_y;
flex_shrink_sum += r.min_y * r.flex_shrink_y;
if (r.flex_shrink_y) {
flex_shrink_size += r.min_y;
}
size += r.min_y;
}
if (extra_space >= 0)
SetBoxGrow(box, extra_space, flex_grow_sum);
else if (flex_shrink_size + extra_space >= 0)
SetBoxShrinkEasy(box, extra_space, flex_shrink_sum);
else
SetBoxShrinkHard(box, extra_space + flex_shrink_size,
size - flex_shrink_size);
}
void SetBoxGrow(Box box, int extra_space, int flex_grow_sum) {
int y = box.y_min;
for (auto& child : children) {
Box child_box = box;
const Requirement& r = child->requirement();
int added_space =
extra_space * r.flex_grow_y / std::max(flex_grow_sum, 1);
extra_space -= added_space;
flex_grow_sum -= r.flex_grow_y;
child_box.y_min = y;
child_box.y_max = y + r.min_y + added_space - 1;
child_box.y_max = y + child->requirement().min_y - 1;
child->SetBox(child_box);
y = child_box.y_max + 1;
}
}
if (child->requirement().flex_y) {
int added_space = remaining_extra_space * child->requirement().flex_y /
remaining_flex;
remaining_extra_space -= added_space;
remaining_flex -= child->requirement().flex_y;
child_box.y_max += added_space;
void SetBoxShrinkEasy(Box box, int extra_space, int flex_shrink_sum) {
int y = box.y_min;
for (auto& child : children) {
Box child_box = box;
const Requirement& r = child->requirement();
int added_space = extra_space * r.min_y * r.flex_shrink_y /
std::max(flex_shrink_sum, 1);
extra_space -= added_space;
flex_shrink_sum -= r.flex_shrink_y * r.min_y;
child_box.y_min = y;
child_box.y_max = y + r.min_y + added_space - 1;
child->SetBox(child_box);
y = child_box.y_max + 1;
}
}
void SetBoxShrinkHard(Box box, int extra_space, int size) {
int y = box.y_min;
for (auto& child : children) {
Box child_box = box;
const Requirement& r = child->requirement();
if (r.flex_shrink_y) {
child_box.y_min = y;
child_box.y_max = y - 1;
child->SetBox(child_box);
continue;
}
child_box.y_max = std::min(child_box.y_max, box.y_max);
int added_space = extra_space * r.min_y / std::max(1, size);
extra_space -= added_space;
size -= r.min_y;
child_box.y_min = y;
child_box.y_max = y + r.min_y + added_space - 1;
child->SetBox(child_box);
y = child_box.y_max + 1;